Question

X la a 2 a + 11x +28 cat face

Answer 1

Răspuns:

$x { }^{2} + 11x + 28 \\ = x {}^{2} + 7x + 4x + 28 \\ = x(x + 7) \times 4(x + 7) \\ = (x + 7)(x + 4)$

Answer 2

Răspuns:

Explicație pas cu pas:

x² + 11 x + 28  = ( x + 4 ) ( x + 7 ) → produs de factori

= x² + ( 4 x + 7 x ) + 28 =

=( x² + 4 x) + ( 7 x + 28 ) =

= x ( x + 4 ) + 7 ( x + 4 ) =

= ( x + 4 ) ( x + 7 )